Look at the motor sometime to see if it lists a duty cycle. Might be a good idea for some compressors to take a break to cool down before its thermal overload turns it off to cool.I have the same compressor as you. I don't have a pot or cabinet but I can say that whenever I use my air D-A the compressor never stops running. I don't like everything getting so hot, so I usually take longer breaks to let it build up and cool off some. It's aggravating but I get through it. I'd really like to get a better two stage, but mine still works so it's staying put for now. To pump up tires and blow things off I use my smaller 5 gallon because the big guy takes too long to pump up.
You must have a leak or two if it bleeds down when sitting.
Mine is pretty much air tight, can go for a week or so with light usage with the breaker turned off and still not low enough pressure to turn on when I flip the breaker back on. But if I leave certain tools plugged into the hose it will leak down some. Hasn't been below 100psi for a year or two since I rebuilt the pump.